Charge forming device with pressure sensor
In at least some implementations, a charge forming device includes a main body having a throttle bore, a throttle valve, a housing and a circuit board including a throttle position sensor and a pressure sensor. The throttle valve is received at least partially within the valve bore, is rotatable between an idle position and a second position, and includes a magnet that is rotated when the throttle valve rotates. The housing is carried by the main body, and the circuit board is carried by the housing. A signal path is defined leading from the pressure sensor to a pressure source, the signal path includes a liquid collection area located below a gaseous area with respect to gravity.
1. A charge forming device, comprising:
a main body having a throttle bore;
a throttle valve received at least partially within the valve bore, the throttle valve being rotatable between an idle position and a second position, and the throttle valve including a magnet that is rotated when the throttle valve rotates;
a housing carried by the main body; and
a circuit board carried by the housing, the circuit board including a throttle position sensor responsive to movement of the magnet, and the circuit board includes a pressure sensor, and wherein a signal path is defined leading from the pressure sensor to a pressure source, the signal path includes a liquid collection area located below a gaseous area with respect to gravity.
2. The device of claim 1 wherein the housing includes a signal passage that defines part of the signal path, and the housing includes a wall that separates the liquid collection area from a portion of the signal path that is connected to the pressure sensor.
3. The device of claim 2 wherein the wall is annular and the wall is located in a cavity defined at least in part by the housing, and wherein the signal passage opens into the cavity at a location radially spaced from the wall, relative to an axis of the throttle valve shaft.
4. The device of claim 2 wherein a portion of the signal path closest to the pressure sensor is located radially inwardly of the wall.
5. The device of claim 4 wherein a first area is defined on one side of the wall with the magnet received in the first area, and the wall defines a second area on a side of the wall opposite to the first area, and wherein the second area includes the liquid collection area below the top of the wall, relative to gravity, and wherein the signal path extends from the first area to the second area over the wall and over the liquid collection area.
6. The device of claim 5 wherein the housing includes a first body and a second body with the first body received between the main body and the second body, and a cavity is defined at least in part by both the first body and the second body, and wherein the wall extends axially into the cavity.
7. The device of claim 6 wherein the circuit board is carried by the second body and wherein part of the signal path is defined by a hole in a dividing wall of the second body, wherein the hole communicates with the first area and is radially spaced from the liquid collection area.
8. The device of claim 6 wherein a signal passage is formed through the first body, the signal passage opens into the second area and defines part of the signal path.
9. The device of claim 1 wherein the main body includes a passage open to the throttle bore and defining part of the signal path.
10. The device of claim 9 wherein the passage of the main body opens into the throttle bore between the throttle valve and an outlet of the throttle bore from which a fuel and air mixture is discharged from the main body.
11. The device of claim 1 wherein the pressure source is atmospheric pressure.
12. The device of claim 1 wherein the signal path is arranged to communicate with an engine manifold that is the pressure source.
13. The device of claim 1 wherein the throttle position sensor and pressure sensor are coupled together for digital communication via a common wire.
14. The device of claim 1 wherein the throttle position sensor is centered relative to an axis of the throttle valve.
15. The device of claim 1 wherein the pressure sensor is lower than the liquid collection area, relative to gravity and relative to the normal orientation of the device in use.
16. The device of claim 15 wherein a portion of the signal path is open directly to the liquid collection area and extends over the liquid collection area.
17. A charge forming device, comprising:
a main body having a throttle bore and a main body passage open to the throttle bore and extending through the main body;
a throttle valve received at least partially within the valve bore, the throttle valve being rotatable between an idle position and a second position, and the throttle valve including a magnet that is rotated when the throttle valve rotates;
a housing carried by the main body, the housing including a cavity in which a portion of the throttle valve including the magnet is received, and the housing including a signal passage communicating at with the main body passage and with the cavity; and
a circuit board carried by the housing, the circuit board including a throttle position sensor and a pressure sensor, and wherein a signal path is defined leading from the pressure sensor to a pressure source, the signal path includes the main body passage, the signal passage and a liquid collection area located below a gaseous area with respect to gravity.
18. The device of claim 17 wherein the housing includes a wall within the cavity, a first area is defined on one side of the wall with the magnet received in the first area, and the wall defines a second area on a side of the wall opposite to the first area, and wherein the second area includes the liquid collection area below a top of the wall, relative to gravity, and wherein the signal path extends from the first area to the second area over the wall and over the liquid collection area.
19. The device of claim 18 wherein the housing includes a first body and a second body with the first body received between the main body and the second body, and the cavity is defined at least in part by both the first body and the second body, and wherein the wall extends axially into the cavity.